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3 years ago

Heya, I only have about 5 minutes so pls see and help quick. Picture attached

Mathematics

1 answer:

WITCHER [35]3 years ago

5 0

it is the first answer. the other answers are WRONG

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Michael works in the marketing department of a company. He recorded the sales of his company for 10 consecutive months. The amou

castortr0y [4]

A) n(t) = 0.1(t - 8)3 + 51.2

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3 years ago

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In a sample of 60 electric motors, the average efficiency (in percent) was 85 and the standard deviation was 2. Section 05.01 Ex

jasenka [17]

Answer:

95% confidence interval for the mean efficiency is [84.483 , 85.517].

Step-by-step explanation:

We are given that in a sample of 60 electric motors, the average efficiency (in percent) was 85 and the standard deviation was 2.

So, the pivotal quantity for 95% confidence interval for the population mean efficiency is given by;

P.Q. = $\frac{\bar X - \mu}{\frac{s}{\sqrt{n} } }$ ~ $t_n_-_1$

where, $\mu$ = sample average efficiency = 85

$\sigma$ = sample standard deviation = 2

n = sample of motors = 60

$\mu$ = population mean efficiency

So, 95% confidence interval for the mean efficiency, $\mu$ is ;

P(-2.0009 < $t_5_9$ < 2.0009) = 0.95

P(-2.0009 < $\frac{\bar X - \mu}{\frac{s}{\sqrt{n} } }$ < 2.0009 ) = 0.95

P( $-2.0009 \times {\frac{s}{\sqrt{n} }$ < ${\bar X - \mu}$ < $2.0009 \times {\frac{s}{\sqrt{n} }$ ) = 0.95

P( $\bar X -2.0009 \times {\frac{s}{\sqrt{n} }$ < $\mu$ < $\bar X +2.0009 \times {\frac{s}{\sqrt{n} }$ ) = 0.95

95% confidence interval for $\mu$ = [ $\bar X -2.0009 \times {\frac{s}{\sqrt{n} }$ , $\bar X +2.0009 \times {\frac{s}{\sqrt{n} }$ ]

= [ $85 -2.0009 \times {\frac{2}{\sqrt{60} }$ , $85 +2.0009 \times {\frac{2}{\sqrt{60} }$ ]

= [84.483 , 85.517]

Therefore, 95% confidence interval for the population mean efficiency is [84.483 , 85.517].

8 0

3 years ago

The perimeter of a square is 18 2. Determine the length of the diagonal.

Natalija [7]

The diagonal of the square is 9.1?

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3 years ago

10x + 7 - 5x - 1 = 41, what are the steps??

ella [17]

Answer:

x=7

Step-by-step explanation:

10x-5x=41-7+1
5x=35
x=35÷5
x=7

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2 years ago

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The set of letters in the word "book"

Helga [31]

Answer:

set of letters of word BOOK is

$\{ B,O,K\}$

mark brainliest please

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4 years ago

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